s1_goto_dir(){
    cd "$1"
}
s2_touch_empty_file_with_given_name(){
    touch "$1"
}
s3_make_directories(){
    mkdir -p projects/git
    mkdir projects/backup
}
s4_create_6_files(){
    touch projects/linux{1,2}_{centos,redhat,c_programming}
}
s5_make_directories_in_git(){
    mkdir -p projects/git/linux{1,2}
}
s6_move_files_to_dir_1_or_2(){
    mv projects/linux1* projects/git/linux1 && mv projects/linux2* projects/git/linux2 
}
s7_create_package_and_compress(){
    tar -czvf projects/backup/git.tar.gz projects/git
}
s8_delete_dir_git(){
    rm -rf projects/git  
}
s9_recover_from_git_tar_gz_backup(){
    tar -zxvf projects/backup/git.tar.gz -C ./
}
s10_create_package_and_compress(){
    tar -jcvf projects/backup/git.tar.bz2 projects/git
}
s11_find_and_sort_alphabetically_all_created_files_and_dirs(){
    find ./projects | sort
}
s12_get_next_15_minutes_boundary(){
date -d "@$(((($(date +%s)+900*1)/900)*900))" "+%Y-%m-%d_%H:%M:%S"
}
